Re: liblockdep soname versioning

From: Sasha Levin
Date: Tue Apr 01 2014 - 11:33:32 EST

On 04/01/2014 09:35 AM, Sasha Levin wrote:
On 04/01/2014 09:28 AM, Josh Boyer wrote:
On Tue, Apr 1, 2014 at 9:19 AM, Sasha Levin <sasha.levin@xxxxxxxxxx> wrote:
On 04/01/2014 08:56 AM, Josh Boyer wrote:

Hi Sasha,

We've had a request [1] to package up liblockdep in Fedora. Looking
things over, I noticed the library isn't actually versioned at all and
instead just builds a plain .so file. That's likely fine during
development of it, but if distros are to ship it for broader use then
it would be a good idea to specify the soname and use a versioned .so.

The makefile already has LIBLOCKDEP_VERSION defined. Would it be
possible to use this as the soname and version number? Then could be the normal symlink to the versioned .so
( in this case).




Sure! I never expected it to live outside the kernel tree as a separate
package, but I'm happy to accommodate for that.

I think that I'll just match the version number with the kernel version
since what mostly matters is what you have in kernel/lockdep.c, so for
example, right now we'll have ''. Sounds good?

The only concern I would have is that it would require applications
linking to it to rebuild with every kernel release even if nothing
else changed. Maybe nothing changing is going to be rare enough that
in practice people will need to rebuild anyway. Either way, it's
better to be explicit rather than break users silently, so it sounds
good to me.

I don't think we ever had a kernel version without changes to lockdep :)

Since lockdep isn't an ABI either, no one promises me it'll work the same
way between versions either, so I'm kinda happy about just forcing rebuilds.

Hi Josh,

Could you please confirm that the below is what you'd expect it to be:

sasha@lappy:~/linux/tools/lib/lockdep$ make
CC FPIC common.o
CC FPIC lockdep.o
CC FPIC preload.o
CC FPIC rbtree.o
BUILD STATIC LIB liblockdep.a

sasha@lappy:~/linux/tools/lib/lockdep$ ls -al
lrwxrwxrwx 1 sasha sasha 20 Apr 1 11:31 ->

sasha@lappy:~/linux/tools/lib/lockdep$ readelf -d | grep SONAME
0x000000000000000e (SONAME) Library soname: [""]


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